A transmission diversity detection system that detects the presence or absence of a STTD (Space-Time Transmit Diversity) transmission diversity by a simple arithmetic operation. The transmission diversity detection circuit notifies presence or absence of a transmission diversity of spread spectrum communication by modulation of a synchronization channel (SCH). The transmission diversity detection circuit includes arithmetic circuit for calculating a calculated value of C2n,0×S2n,0*+C2n,0*×S2n,0+C2n,1*×C2n,1, in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary common pilot channel (CPICH) symbol with respect to the first symbol as C2n,0, a SCH symbol with respect to the first symbol as S2n,0, and a primary CPICH symbol with respect to the second symbol as C2n,1, taking a complex conjugate of the primary CPICH symbol C2n,0 as C2n,0*, a complex conjugate of SCH symbol S2n,0 as S2n,0*, and a complex conjugate of the primary CPICH symbol C2n,1 as C2n,1* and judgment circuit for making judgment whether transmission diversity is present or not depending upon positive or negative of the calculated value.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A transmission diversity detection circuit for notifying presence or absence of a transmission diversity of spread spectrum communication by modulation of SCH (Synchronization channel), comprising: arithmetic means for calculating a calculated value of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary CPICH (common pilot channel) symbol with respect to said first symbol as C 2n,0 , a SCH symbol with respect to said first symbol as S 2n,0 , a primary CPICH symbol with respect to said second symbol as C 2n,1 ; taking a complex conjugate of said primary CPICH symbol C 2n,0 as C 2n,0 *, a complex conjugate of SCH symbol S 2n,0 as S 2n,0 *, a complex conjugate of said primary CPICH symbol C 2n,1 as C 2n,1 *; and judgment means for making judgment whether transmission diversity is present or not depending upon positive or negative of said calculated value.
2. A transmission diversity detection circuit as set forth in claim 1 , wherein said arithmetic means comprises: circuits for deriving said complex conjugate C 2n,0 * of said primary CPICH symbol C 2n,0 , a complex conjugate S 2n,0 * of SCH symbol S 2n,0 , and a complex conjugate C 2n,1 * of said primary CPICH symbol C 2n,1 ; multipliers calculating C 2n,0 ×S 2n,0 *, C 2n,0 *×S 2n,0 and C 2n,1 *×C 2n,1 ; and an adder calculating a sum of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , said judgment means makes judgment whether transmission diversity is performed or not depending upon positive or negative of sign of said sum.
3. A transmission diversity detection circuit as set forth in claim 1 , wherein said predetermined slot is even numbered slots in one frame, said first and second symbols are (0)th and first symbols of said slot.
4. A transmission diversity detection circuit as set forth in claim 1 , wherein said arithmetic means performs arithmetic operation upon performing communication.
5. A transmission diversity detection circuit as set forth in claim 1 , wherein said arithmetic means performs arithmetic operation upon registration of position for communication.
6. A transmission diversity detection method for notifying presence or absence of a transmission diversity of spread spectrum communication by modulation of SCH (Synchronization channel), comprising: calculating a calculated value of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary CPICH (Common pilot channel) symbol with respect to said first symbol as C 2n,0 , a SCH symbol with respect to said first symbol as S 2n,0 , and a primary CPICH symbol with respect to said second symbol as C 2n,1 , and taking a complex conjugate of said primary CPICH symbol C 2n,0 as C 2n,0 *, a complex conjugate of SCH symbol S 2n,0 as S 2n,0 *, and a complex conjugate of said primary CPICH symbol C 2n,1 as C 2n,1 *; and judging whether transmission diversity is present or not depending upon positive or negative of said calculated value.
7. A transmission diversity detection method as set forth in claim 6 , wherein said calculating step comprises: deriving said complex conjugate C 2n,0 * of said primary CPICH symbol C 2n,0 , a complex conjugate S 2n,0 * of SCH symbol S 2n,0 , and a complex conjugate C 2n,1 * of said primary CPICH symbol C 2n,1 ; calculating C 2n,0 ×S 2n,0 *, C 2n,0 *×S 2n,0 and C 2n,1 *×C 2n,1 ; and calculating a sum of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , said judging step judges whether transmission diversity is performed or not depending upon positive or negative of sign of said sum.
8. A transmission diversity detection method as set forth in claim 6 , wherein said predetermined slot is even numbered slots in one frame, said first and second symbols are (0)th and first symbols of said slot.
9. A storage medium storing a program implementing a transmission diversity detection method for notifying presence or absence of a transmission diversity of spread spectrum communication by modulation of SCH (Synchronization channel), said program comprising: calculating a calculated value of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary CPICH (Common pilot channel) symbol with respect to said first symbol as C 2n,0 , a SCH symbol with respect to said first symbol as S 2n,0 , and a primary CPICH symbol with respect to said second symbol as C 2n,1 , and taking a complex conjugate of said primary CPICH symbol C 2n,0 as C 2n,0 *, a complex conjugate of SCH symbol S 2n,0 as S 2n,0 *, and a complex conjugate of said primary CPICH symbol C 2n,1 as C 2n,1 *; and judging whether transmission diversity is present or not depending upon positive or negative of said calculated value.
10. A storage medium as set forth in claim 9 , wherein said calculating step comprises: deriving said complex conjugate C 2n,0 * of said primary CPICH symbol C 2n,0 , a complex conjugate S 2n,0 * of SCH symbol S 2n,0 , a complex conjugate C 2n,1 * of said primary CPICH symbol C 2n,1 and a complex conjugate S 2n,1 * of said SCH symbol S 2n,1 ; calculating C 2n,0 ×S 2n,0 *, C 2n,0 *×S 2n,0 and C 2n,1 *×C 2n,1 ; and calculating a sum of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , said judging step judges whether transmission diversity is performed or not depending upon positive or negative of sign of said sum.
11. A storage medium as set forth in claim 9 , wherein said predetermined slot is even numbered slots in one frame, said first and second symbols are (0)th and first symbols of said slot.
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December 21, 2000
February 22, 2005
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